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Pension and Other Postretirement Benefit Plans - Expected Benefit Payments (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
U.S. | Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 $ 20.1
2021 20.9
2022 22.6
2023 23.3
2024 23.3
Five years thereafter 126.3
U.S. | Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2020 4.0
2021 3.9
2022 3.9
2023 3.9
2024 3.9
Five years thereafter 17.6
Foreign | Pension  
Defined Benefit Plan Disclosure [Line Items]  
2020 22.0
2021 18.8
2022 20.2
2023 20.0
2024 20.7
Five years thereafter 122.5
Foreign | Other Postretirement  
Defined Benefit Plan Disclosure [Line Items]  
2020 1.4
2021 1.5
2022 1.5
2023 1.5
2024 1.5
Five years thereafter $ 7.1